# Exhaust Noise. **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [July 23, 2007, 8:58pm UTC](https://forums.speedlife.net/t/exhaust-noise/32855 "2007-07-23T20:58:06Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![nytib](https://avatars.discourse-cdn.com/v4/letter/n/8e7dd6/32.png) [@nytib](https://forums.speedlife.net/u/nytib)\ **Post date:** [July 23, 2007, 8:58pm UTC](https://forums.speedlife.net/t/exhaust-noise/32855/1 "2007-07-23T20:58:06Z")
There is a ratteling noise coming from my exhaust just after i shift or in very low rpm’s for the first 3 gears. Headers hiflo cat and cat back were installed less than 2 years ago. ---
**Author:** ![dawn](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dawn/32/7209_2.png) [@dawn](https://forums.speedlife.net/u/dawn)\ **Post date:** [July 23, 2007, 9:01pm UTC](https://forums.speedlife.net/t/exhaust-noise/32855/2 "2007-07-23T21:01:55Z")
It’s probably vibrating on something underneath your car. I’m a genius. It’s not a big deal. ---
**Author:** ![MaximaSE98](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/maximase98/32/7600_2.png) [@MaximaSE98](https://forums.speedlife.net/u/MaximaSE98)\ **Post date:** [July 23, 2007, 9:03pm UTC](https://forums.speedlife.net/t/exhaust-noise/32855/3 "2007-07-23T21:03:53Z")
get it in the air and check for rubbing…was there a heat shield on that high-flow cat ---
**Author:** ![nytib](https://avatars.discourse-cdn.com/v4/letter/n/8e7dd6/32.png) [@nytib](https://forums.speedlife.net/u/nytib)\ **Post date:** [July 23, 2007, 9:19pm UTC](https://forums.speedlife.net/t/exhaust-noise/32855/4 "2007-07-23T21:19:18Z")
[quote=“MaximaSE98,post:3,topic:32855"”] get it in the air and check for rubbing…was there a heat shield on that high-flow cat [/quote] yes there is a heat shield on the cat, i checked under the car it is not rubbing any where, it sounds like it’s coming from the hiflow cat itself ---
**Author:** ![Justin](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/justin/32/7459_2.png) [@Justin](https://forums.speedlife.net/u/Justin)\ **Post date:** [July 23, 2007, 10:00pm UTC](https://forums.speedlife.net/t/exhaust-noise/32855/5 "2007-07-23T22:00:55Z")
[quote=“nytib,post:4,topic:32855"”] yes there is a heat shield on the cat, i checked under the car it is not rubbing any where, it sounds like it’s coming from the hiflow cat itself [/quote] Answered your own question. Heat Shield. ---
**Author:** ![nytib](https://avatars.discourse-cdn.com/v4/letter/n/8e7dd6/32.png) [@nytib](https://forums.speedlife.net/u/nytib)\ **Post date:** [July 24, 2007, 3:51am UTC](https://forums.speedlife.net/t/exhaust-noise/32855/6 "2007-07-24T03:51:23Z")
could part of the pipe have rusted off on the inside and is trapped inside the cat? ---
**Author:** ![ieatpaint](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ieatpaint/32/7311_2.png) [@ieatpaint](https://forums.speedlife.net/u/ieatpaint)\ **Post date:** [July 24, 2007, 4:17am UTC](https://forums.speedlife.net/t/exhaust-noise/32855/7 "2007-07-24T04:17:54Z")
One thing I’ve learned is to check the simplest first, then start worrying. Once you rule out your heat shield is solid check back. ---
**Author:** ![Bacon](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bacon/32/7230_2.png) [@Bacon](https://forums.speedlife.net/u/Bacon)\ **Post date:** [July 24, 2007, 4:26am UTC](https://forums.speedlife.net/t/exhaust-noise/32855/8 "2007-07-24T04:26:05Z")
Poor clearances, or heat shield. ---
**Author:** ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)\ **Post date:** [July 24, 2007, 5:10am UTC](https://forums.speedlife.net/t/exhaust-noise/32855/9 "2007-07-24T05:10:17Z")
I can’t believe nobody’s suggested spun muffler bearings yet. :ham: Just get under the car and start wiggling things until you find something loose hitting another hard part, start with the cat and any heat shield at the cat.